It is being reported by Variety that Sony’s Sinister Six movie (think all of the villains from Spider-Man) will be released November 11th 2016. The Amazing Spider-Man 3 in turn has been put back to an unknown date in 2018.
This is quite a change given the fourth Spider-Man movie in its current guise was supposed to be released in May 2018. One can only speculate why. I suspect it’s the mixed reviews that The Amazing Spider-Man 2 received which seemed to come to a shock to Sony who were very confident in this property. But who knows, maybe the Studio has decided that the Sinister Six can be used as a stepping stone to an even bigger story-line.